+--NNNNNNNNNN-eximdsn-MMMMMMMMMM
+Content-type: message/delivery-status
+
+Reporting-MTA: dns; the.local.host.name
+
+Action: failed
+Final-Recipient: rfc822;":fail: fail message"@special
+Status: 5.0.0
+X-Exim-Diagnostic: X-str; fail message
+
+--NNNNNNNNNN-eximdsn-MMMMMMMMMM
+Content-type: message/rfc822